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Fluid Mechanics

Fluid Mechanics
The unit of velocity head is

ft-lbf/sec
ft-lbf/lb
ft-lb/sec
ft-lb/ft³

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Fluid Mechanics
Applying a pressure drop across a capillary results in a volumetric flow rate 'Q' under laminar flow conditions. The flow rate for the same pressure drop, in a capillary of the same length but half the radius is

Q/2
Q/16
Q/4
Q/8

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Fluid Mechanics
As the velocity V and thus the Reynolds number of a flow past a sphere increases from very low value, the drag force for Re << 1

Increases linearly with V
Decreases linearly with V
None of these
Decreases as V²

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Fluid Mechanics
The terminal velocity of a small sphere settling in a viscous fluid varies as the

First power of its dimeter
Inverse of the fluid viscosity
Square of the difference in specific weights of solid & fluid
Inverse square of the diameter

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Fluid Mechanics
Toothpaste is a

Bingham plastic
Dilatent
Pseudoplastic
Newtonion liquid

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Fluid Mechanics
The ratio of hydrodynamic boundary layer to thermal boundary layer thickness in case of liquid metals is

2
1
< 1
> 1

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